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CHAPTER 3: CRYSTAL STRUCTURES

CRYSTAL Structure: Basic Definitions - lecture Calculation of material density self-prep. CRYSTAL Systems lecture + self-prep. Introduction to Crystallography lecture + self-prep. X-Ray Diffraction (XRD) lecture CHAPTER 3: CRYSTAL STRUCTURES atoms pack in periodic, 3D arrays typical of: Crystalline -metals -many ceramics -some polymers atoms have no periodic packing occurs for: Non-crystalline -complex STRUCTURES -rapid cooling crystalline SiO2 Non-crystalline SiO2 "Amorphous" = Non-crystalline MATERIALS AND PACKING Glass-Ceramics Quartz tubing is fabricated from beach sand The lamp applications are shown in the GE product montage Ceramics Crystals: atoms have long range periodic order Glasses (non-crystalline).

• Introduction to Crystallography – lecture + self-prep. ... ( Hurlbut & Klein, 1977, Manual of Mineralogy) Point Symmetries It is a macroscopically visible symmetry operations: after it has been applied to the crystal at least one point remains where it was !!

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